Hi Frederic…
A good idea if you buy a parking spot is to rent it out to, say, four motorcyclists, rather than as a single parking spot.
In the area where I live…Poblenou….a parking space goes for around 80/90 Euros a month….whereas if you rent it out to four motorcyclists you would probably get 30 Euros from each of them….making 120 a month.
By the way…I don´t think you would get a parking space for 10000 euros though.!!!